Upgrade to WordPress 2.9 and Simple Tags error solution

Accordingly to wordpress.org , the coolest new stuff from a user point of view is:

Global undo/”trash” feature, which means that if you accidentally delete a post or comment you can bring it back from the grave (i.e., the Trash).

Built-in image editor allows you to crop, edit, rotate, flip, and scale your images to show them who’s boss. This is the first wave of our many planned media-handling improvements.

Batch plugin update and compatibility checking, which means you can update 10 plugins at once, versus having to do multiple clicks for each one, and we’re using the new compatibility data from the plugins directory to give you a better idea of whether your plugins are compatible with new releases of WordPress.

Easier video embeds that allow you to just paste a URL on its own line and have it magically turn it into the proper embed code, with Oembed support for YouTube, Daily Motion, Blip.tv, Flickr, Hulu, Viddler, Qik, Revision3, Scribd, Google Video, Photobucket, PollDaddy, and WordPress.tv.

After upgraded, a notice of Simple Tags can’t work with this WordPress version !.The soution is pretty simple
1. Under the dashboard, click plugins
2. Under the plugins, select editor
3. Find Select plugin to edit: Select Simple Tags
4. Edit the plugin via the editor interface, find this line (near the top):